<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      body {
        margin: 0;
        padding: 0;
        background-image: url(../images/grid.png);
      }
      .box {
        width: 200px;
        height: 100px;
        background-color: skyblue;

        /* 形变 */
        /* transform: rotate(45deg); */
        transform: rotate3d(0, 0, 1, 45deg);
      }
    </style>
  </head>
  <body>
    <div class="box">div</div>
  </body>
</html>
